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Contents | Introduction | Symbols Legend | Scheme Book

Interlock Application - Prevent Paralleling of Lines
Scheme # 18
To prevent paralleling of lines A, B, and C. Three loads, fed from any source (three tie-breakers).

Interlock Application Scheme # 18 - Preven Paralleling of Lines

Breaker A is closed to supply load M. Breaker B is closed to supply load N. Breaker C is closed to supply load P. Keys A-1, B-1, and C-1 are held in L-O interlocks on breakers A, B and C. Tie-breakers D, E, and F are locked open. Master or apartment lock interlocks are mounted on tie-breakers D, E, and F, and can be unlocked for operation with either keys A-1 or B-1, B-1 or C-1, and A-1 or C-1, respectively.

To transfer load M from breaker A to breaker B:

  1.
2.

3.

4.
 Open breaker A.
Turn key A-1 in L-O interlock on breaker A to lock open. Key A-1 is now free.
Insert key A-1 in L-O interlock on tie-breaker D and turn to unlock. Key A-1 is now held.
Close tie-breaker D.

Reverse sequence to restore service through breaker A.

To transfer load M and N from breaker A and B to breaker C:

  1.
2.
3.

4.

5.
Close tie-breaker D as above.
Open breaker B.
Turn key B-1 in L-O interlock on breaker B to lock open. Key B-1 is now free.
Insert key B-1 in L-O interlock on tie-breaker E and turn to unlock. Key B-1 is now held.
Close tie-breaker E.

Reverse sequence to restore service (loads M and N) through breakers A and B.

To transfer load P from breaker C to breaker A:

  1.
2.

3.

4.
 Open breaker C.
Turn key C-1 in L-O interlock on breaker C to lock open. Key C-1 is now free.
Insert key C-1 in L-O interlock on tie breaker F and turn to unlock. Key C-1 is now held.
Close tie-breaker F.

Reverse sequence to restore service through breaker C.

Links for more interlock application scheme information:

Contents | Introduction | Symbols Legend | Scheme Book

Scheme # 25
Scheme # 26
Scheme # 27 Scheme # 28
Scheme # 29
Scheme # 30
Scheme # 31
Scheme # 32
Scheme # 33 Scheme # 34
Scheme # 35
Scheme # 35A
Scheme # 36

 Scheme # 37
Scheme # 38 Scheme # 39
Scheme # 40
Scheme # 41
Scheme # 42
Scheme # 42A
Scheme # 42B
Scheme # 43
Scheme # 43A
Scheme # 44
Scheme # 45
Scheme # 45A
 
   

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